<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="./CSS/index1.css">
</head>

<body>
    <div class="main">
        <span>省：</span>
        <select style="width: 100px;" id="pre" onchange="chg(this);">
            <option value="-1" disabled selected>请选择省</option>
        </select>
        <span>市：</span>
        <select style="width: 100px;" id="city" onchange="chg2(this)" ;>
            <option value="-1" disabled selected>请选择市</option>
        </select>
        <span>区：</span>
        <select style="width: 100px;" id="area">
            <option value="-1" disabled selected>请选择区</option>
        </select>
    </div>
</body>
<script src="./JS/index1.js"></script>

</html>